Hi;
I am sure my approach is totally different . I sand the Canopy inside and out with 3200 grit wet and sloppy .then I get jewelry polish or headlight cover polish .The second by KIT in an auto parts store .
Then the fun . A big glob of polish and a " Q ' tip with added cotton and just scrub away on the inside till it gets shiny and mark free .Then Tooth paste for the finish on the outside . You don't really need that Future stuff . Use the Novus system # 2 polish and finisher .
The biggest thing is to never put the canopy in a strain , like squeezing or flattening .Be very careful and let it float around in the palm of your hand if you think you might hurt it . T.B.